| Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) |
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| 01/25/1989 | CN1030647A Identification system for stock farms |
| 01/24/1989 | US4800390 Adaptive antenna arrays for frequency hopped systems |
| 01/24/1989 | CA1249344A1 Radio receiver for carrying out self diagnosis without interference |
| 01/24/1989 | CA1249342A1 Optical repeater and regulated current feeding system for the same |
| 01/19/1989 | DE3722241A1 Method for transmitting a monophonic broadcast signal |
| 01/18/1989 | EP0299557A1 Identification system for stock farms |
| 01/18/1989 | EP0299162A2 Multiple built-in connector |
| 01/18/1989 | EP0298959A1 Fm receiver with noise suppression during rayleigh faded received signals. |
| 01/18/1989 | CN2031181U High anti-interference multi-purpose remote control receiver |
| 01/18/1989 | CN2031180U Micro computer voice-frequency processer |
| 01/18/1989 | CN1030506A Telephone transmitter-receiver set capable of operating handset by wireless system |
| 01/17/1989 | US4799237 Channel-system exchange system for digital data radio-communication system |
| 01/17/1989 | US4799214 Two-wire full duplex frequency division multiplex modem system having echo cancellation means |
| 01/17/1989 | US4799066 Impedance matching arrangement |
| 01/17/1989 | US4799063 Method and apparatus for isolating faults in an antenna system |
| 01/17/1989 | US4799062 Radio position determination method and apparatus |
| 01/17/1989 | US4799035 Microwave diode tuning circuit |
| 01/17/1989 | US4799029 Saw oscillator with attenuator for protecting saw element |
| 01/17/1989 | US4798982 Active symmetrical balance hybrid circuit |
| 01/12/1989 | DE3720400C1 Audion circuit for radio time signal receivers |
| 01/11/1989 | EP0298759A2 Housing and holder assembly for a portable communication apparatus |
| 01/11/1989 | EP0298720A2 Housing structure for paging receiver |
| 01/10/1989 | US4797950 Multipath reduction system |
| 01/10/1989 | US4797903 Channel switching system without instantaneous signal loss |
| 01/10/1989 | US4797844 Digital mixing apparatus which attenuates the sum frequency of the mixed signals |
| 01/10/1989 | CA1248593A1 Squelch detecting circuit with squelch start determining means |
| 01/10/1989 | CA1248591A1 Battery-powered mobile communications apparatus having transmitter reset function |
| 01/10/1989 | CA1248589A1 Mobile radio telephone |
| 01/04/1989 | EP0297688A1 Electronic identification system |
| 01/04/1989 | EP0297403A2 Method for transmitting and/or recording and playing back digitized audio signals |
| 01/04/1989 | CN1030162A Orthogonal-polarization duplex send-receive microwave head |
| 01/03/1989 | US4796296 PCM coder and decoder having function of two-wire/four-wire conversion |
| 01/03/1989 | US4796213 Method of filtering signals for a controller of a turbo compressor |
| 01/03/1989 | CA1248234A1 Frequency domain speech coding |
| 12/29/1988 | WO1988010548A1 Low power digital receiver |
| 12/29/1988 | WO1988010539A1 Apparatus for achieving a controllable line termination impedance |
| 12/28/1988 | EP0296838A2 Monolithic microwave transmitter/receiver |
| 12/28/1988 | CN87101067A Earplug type miniature radio cassette recorder |
| 12/27/1988 | US4794649 Radio communication system with power saving disablement prior to call handling processes |
| 12/27/1988 | US4794622 Low power transmitter frequency stabilization |
| 12/27/1988 | US4794489 Portable radio transceiver housing structurally supported by a battery |
| 12/21/1988 | EP0295973A1 Noise reduction arrangement for ultra-high frequency amplifier and amplifier-antenna connection including such an arrangement |
| 12/21/1988 | EP0295688A1 Microwave primary emitting-receiving duplexer-unit for orthogonaly polarised waves |
| 12/21/1988 | EP0295373A2 Computerized mobile two-way radio system with serial interface |
| 12/21/1988 | CN88202578U Radio transmitter for low-resistance sound signal |
| 12/21/1988 | CN88102082A Filtering apparatus of fm ultrashort wave receiving signal |
| 12/21/1988 | CN87216712U Infrared acoustic frequency signal sending machme |
| 12/21/1988 | CN87103908A Dynamic antenna tuning system and method |
| 12/20/1988 | US4792994 Radio equipped thermos |
| 12/20/1988 | US4792992 Radio receiver |
| 12/20/1988 | US4792991 FM receiver having improved audio quality in response to Rayleigh faded received signals |
| 12/20/1988 | US4792987 Antenna coupling amplifier and converter system |
| 12/20/1988 | US4792986 Portable radio system with externally programmable universal device connector |
| 12/20/1988 | US4792939 Duplex radio communication transceiver |
| 12/20/1988 | CA1247266A1 Wireless telephone system |
| 12/20/1988 | CA1247206A1 Protection switching system for carrier transmission line |
| 12/20/1988 | CA1247199A2 Retainer for radio receiver |
| 12/15/1988 | WO1988010045A1 Adaptive frequency modulation |
| 12/15/1988 | WO1988010035A1 Protection of energy information in sub-band coding |
| 12/15/1988 | WO1988010033A1 Dual port fm demodulation in phase locked receivers |
| 12/15/1988 | WO1988009967A1 Method for error correction in digitally encoded speech |
| 12/15/1988 | DE3717009A1 Radio unit for a mobile radio system |
| 12/14/1988 | EP0295146A2 Supervised, interactive alarm reporting system |
| 12/14/1988 | EP0294570A2 Extrema coder employing noisy limiting amplifier stages |
| 12/14/1988 | CN87103672A Scanning receiver for nationwide radio paging system |
| 12/13/1988 | US4790417 Brief case with a portable wireless telephone |
| 12/13/1988 | CA1246735A1 Antenna circuit |
| 12/13/1988 | CA1246708A1 Transceiver with auto frequency sense |
| 12/07/1988 | EP0293873A2 A signal distinction circuit |
| 12/07/1988 | EP0293828A2 Circuit device for demodulating DSB modulated signals and method therefor |
| 12/07/1988 | EP0293464A1 Process for transmitting and/or evaluating on the receiver side information inside a radio signal. |
| 12/07/1988 | CN87101170A Millimeter wave wide-band direct-frequency modulator |
| 12/06/1988 | US4790030 Tuner with insertable antenna coupler |
| 12/06/1988 | US4790015 Multirate digital transmission method and device for implementing said method |
| 12/06/1988 | US4789897 Frequency converting apparatus for converting an RF television signal to a video signal employing low IF techniques |
| 12/06/1988 | CA1246254A1 System for improving signal-to-noise ratio in a direct sequence spread spectrum signal receiver |
| 12/06/1988 | CA1246151A1 Autodyne receiver |
| 12/06/1988 | CA1246150A1 Noise blanking signal generator for am radio |
| 12/01/1988 | WO1988009571A1 Apparatus for electrically connecting two audio components utilizing different sized conductors |
| 12/01/1988 | DE3816462A1 Method for transmitting signals via a narrowband channel |
| 11/30/1988 | EP0293287A1 Spread spectrum phase demodulator test system |
| 11/30/1988 | EP0293197A2 A multi-drop type bus line system |
| 11/30/1988 | EP0293099A1 Microwave landing system with fail-soft switching of dual transmitters, beam steering and sector antennas |
| 11/30/1988 | EP0293039A1 Bipolar transistor amplifier |
| 11/30/1988 | EP0292996A2 Digital two-way radiocommunication system using single frequency |
| 11/30/1988 | CN87103474A Cable wire-distinguishing equipment |
| 11/29/1988 | US4788543 Apparatus and method for broadcasting priority rated messages on a radio communications channel of a multiple transceiver system |
| 11/29/1988 | US4788513 Remanent subcarrier component suppressing device for balanced modulator |
| 11/29/1988 | US4787862 Apparatus for electrically connecting two audio components utilizing different sized conductors |
| 11/29/1988 | CA1245781A1 Timing signal correction system for use in direct sequence spread spectrum signal receiver |
| 11/29/1988 | CA1245780A1 Method of reconstructing lost data in a digital voice transmission system and transmission system using said method |
| 11/24/1988 | DE3721918C1 Method for evaluating the suitability for reception of the frequency-modulated broadcast transmissions received in an FM broadcast receiver, and circuit arrangement for carrying out the method |
| 11/24/1988 | DE3715901A1 Generator for feeding an ELF antenna |
| 11/23/1988 | EP0291935A2 FMX stereophonic broadcast receiver |
| 11/23/1988 | EP0291827A2 Dar radio with an electronic antitheft device |
| 11/23/1988 | CN88100919A Fm/fmx stereophonic receiver |
| 11/23/1988 | CN88100369A Fmx stereophonic receiver |
| 11/23/1988 | CN87103366A Wireless data transmitter |
| 11/22/1988 | CA1245356A1 Data network interface module |
| 11/22/1988 | CA1245354A1 Adaptive antenna array |